diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,28 @@
+Copyright 2020 Bitnomial, Inc.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+# 1.1.0
+
+Adds standard error codes to the library.
+
 # 1.0.0
 
 First release
diff --git a/servant-jsonrpc.cabal b/servant-jsonrpc.cabal
--- a/servant-jsonrpc.cabal
+++ b/servant-jsonrpc.cabal
@@ -1,7 +1,7 @@
 cabal-version:       2.4
 
 name:                servant-jsonrpc
-version:             1.0.0
+version:             1.0.1
 author:              Ian Shipman <ics@gambolingpangolin.com>
 maintainer:          Ian Shipman <ics@gambolingpangolin.com>
 
@@ -12,8 +12,10 @@
     used in concert with servant to compose type level API specifications for
     JSON-RPC endpoints.
 
-homepage:            https://github.com/GambolingPangolin/servant-jsonrpc
-license:             ISC
+homepage:            https://github.com/bitnomial/servant-jsonrpc
+license:             BSD-3-Clause
+license-file:        LICENSE
+copyright:           Bitnomial, Inc. (c) 2020
 category:            Web
 build-type:          Simple
 
@@ -21,7 +23,7 @@
 
 source-repository head
   type:     git
-  location: https://github.com/GambolingPangolin/servant-jsonrpc.git
+  location: https://github.com/bitnomial/servant-jsonrpc.git
 
 library
   default-language:    Haskell2010
diff --git a/src/Servant/JsonRpc.hs b/src/Servant/JsonRpc.hs
--- a/src/Servant/JsonRpc.hs
+++ b/src/Servant/JsonRpc.hs
@@ -22,7 +22,8 @@
 module Servant.JsonRpc
     (
     -- * API specification types
-      JsonRpc
+      RawJsonRpc
+    , JsonRpc
     , JsonRpcNotification
 
     -- * JSON-RPC messages
@@ -30,6 +31,13 @@
     , JsonRpcResponse (..)
     , JsonRpcErr (..)
 
+    -- ** Standard error codes
+    , parseErrorCode
+    , invalidRequestCode
+    , methodNotFoundCode
+    , invalidParamsCode
+    , internalErrorCode
+
     -- * Type rewriting
     , JsonRpcEndpoint
     ) where
@@ -102,6 +110,26 @@
     } deriving (Eq, Show)
 
 
+parseErrorCode :: Int
+parseErrorCode = -32700
+
+
+invalidRequestCode :: Int
+invalidRequestCode = -32600
+
+
+methodNotFoundCode :: Int
+methodNotFoundCode = -32601
+
+
+invalidParamsCode :: Int
+invalidParamsCode = -32602
+
+
+internalErrorCode :: Int
+internalErrorCode = -32603
+
+
 instance (FromJSON e, FromJSON r) => FromJSON (JsonRpcResponse e r) where
     parseJSON = withObject "Response" $ \obj -> do
         ix      <- obj .:  "id"
@@ -139,14 +167,17 @@
         object [ "jsonrpc" .= ("2.0" :: String)
                , "id"      .= ix
                , "error"   .= detail
-
                ]
 
          where
          detail = object [ "code"    .= c
                          , "message" .= msg
                          , "data"    .= err
-                           ]
+                         ]
+
+
+-- | A JSON RPC server handles any number of methods.  Represent this at the type level using this type.
+data RawJsonRpc api
 
 
 -- | JSON-RPC endpoints which respond with a result